Now that we've run through the income statement and balance sheet, it's time to take a look at arguably the most important as well as the most complex of the three major types of financial statements, the statement of cash flows. The statement of cash flows tells you how much cash went into and out of a company during a specific time frame like a quarter or a year. In other words, it shows how much cash a company is generating from one period to the next--and cash is what matters most.